24 



HELEN B. HUBBERT 



began. They were lively, but did not show the superabundant 

 activity of the twenty-five day group, and were not so speedy. 

 Twenty-seven rats were run, sixteen males and eleven females, 

 representing nine strains as follows: 



Trials varied from fourteen to sixty-five, absolute time from 

 four and seven tenths to eleven and eight tenths seconds, total 

 time from sixty-four minutes to seven hundred thirty-one min- 

 utes, and total distance from ninety-one and eight tenths meters 

 to seven hundred fifty meters. Here, as in the preceding group, 

 we can trace no close connection between number of trials and 

 time or distance. The rat which finished in the fewest number 

 of trials had a low time record and the lowest distance record 

 for the group, while the one requiring the greatest number of 

 trials had the highest time and distance records. So far the 

 relation seems very close. But the lowest time record was 

 made by a rat finishing in twenty-two trials, whose distance 

 record was high, while two other rats which finished at twenty- 

 two trials had very high time and distance records. The next 

 to the highest distance record was by a rat finishing in fifty- 

 four trials, while the next to the highest time record was made 

 by one which finished in twenty-two trials. In general, where 

 the trials run very high (65, 54) or very low (14, 16) the dis- 

 tance corresponds rather closely, but for the trials lying between 

 these extremes no such correspondence can be traced. The 

 ratio between time and distance in this group is by no means 

 constant. See table III. The group averages are: 



Time 



Speed 



Trials Absolute Total Distance 



31 6.8 sec. 219 min. 260.6m. 19.8 cm. per sec. 



